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This can be seen when the eyes are closed and looking at the back of the eyelids. In a bright room, a dark red can be seen, owing to a small amount of light penetrating the eyelids and taking on the color of the blood it has passed through. In a dark room, blackness can be seen or the object can be more colourful.
The carnelian is a siliceous stone and a species of chalcedony. Its colour is a flesh-hued red, varying from the palest flesh-colour to a deep blood-red. It is of a conchoidal structure. Normally its colour is without clouds or veins; but sometimes delicate veins of extremely light red or white are found arranged much like the rings of an agate.
A light brown iris with prominent limbal ring. Light brown irises contain pheomelanin. Iris color is a highly complex phenomenon consisting of the combined effects of texture, pigmentation, fibrous tissue, and blood vessels within the iris stroma, which together make up an individual's epigenetic constitution in this context.
Ophthalmogram showing blood vessels in front of the retina. Their shadow is the cause of the blue field entoptic phenomenon. The dots are white blood cells moving in the capillaries in front of the retina of the eye. Blue light (optimal wavelength: 430 nm) is absorbed by the red blood cells that fill the capillaries.
It’s not the only color for a cause. Purple probably won’t be the only porch light color you’ll see. People use red porch lights to highlight women’s heart health. And blue porch lights ...
Blood pressure ( BP) is the pressure of circulating blood against the walls of blood vessels. Most of this pressure results from the heart pumping blood through the circulatory system. When used without qualification, the term "blood pressure" refers to the pressure in a brachial artery, where it is most commonly measured.
Atherosclerosis, the narrowing of the blood vessels due to the buildup of plaque, and the coronary artery disease that often follows can cause heart attacks or cardiac arrest and is the leading cause of death worldwide resulting in 8.9 million deaths or 16% of all deaths. Blood vessel permeability is increased in inflammation.
The word purpura (/ ˈ p ɜːr p ɜːr ə /) comes from Latin purpura, "purple", which came from ancient Greek πορφύρα. Purpura is a mass noun naming the condition or state, not the name of an individual spot (thus there is no *pupurum, *purpura or *purpura, *purpurae count declension). See also. Bruise, which is a hematoma caused by trauma